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07 Sep 2013, 06:00
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If x > 0 and y < 0, what is the value of x + y?
(1) |x| = |y|
(2) x^2 = y^2
(1) |x| = |y|
(2) x^2 = y^2
07 Sep 2013, 06:03
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aparnaharish
If x > 0 and y < 0, what is the value of x + y?
(1) |x| = |y|
(2) x^2 = y^2
(1) |x| = |y|
(2) x^2 = y^2
We know that x>0 and y<0. Thus, \(x\neq{y}\) \(\to (x-y)\neq{0}\)
From F.S 1, square on both sides : \(x^2 = y^2 \to (x+y)(x-y)=0\). Thus, x+y =0.Sufficient.
F.S 2 is exactly the same as above. Sufficient.
D.
07 Sep 2013, 06:12
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If x > 0 and y < 0, what is the value of x + y?
(1) |x| = |y|. Since x > 0 and y < 0, then |x| = x and |y|=-y --> x = -y --> x + y = 0. Sufficient.
(2) x^2 = y^2 --> |x| = |y|. The same here. Sufficient.
Answer: D.
(1) |x| = |y|. Since x > 0 and y < 0, then |x| = x and |y|=-y --> x = -y --> x + y = 0. Sufficient.
(2) x^2 = y^2 --> |x| = |y|. The same here. Sufficient.
Answer: D.
